Till a few weeks the number if T-90s was stuck at 500.. Due to Russia not sending the key parts for assembly to india.
Spec wise AK trumps t-90... And so does numerically -600 are in service.
Arjun isn't even worth it -- sorry to say..
T-72s also face issues like night blindness (although a fee hundred were upgraded).. But bursting barrels n obsolete ammo remains an issue.
..
Meanwhile ;
600 AK-I's
325 T-89UDs (upgraded)
500+ AZs
Upgraded T85II
Etc are serving PA.
Meanwhile
AKII is on the horizon.
A new tank either Oplot M,T-99A2 will be introduced.